Figure 2
From: Qubit-flip-induced cavity mode squeezing in the strong dispersive regime of the quantum Rabi model

Degree of squeezing
as a function of the light-matter coupling strength g for the dispersive eigenstates
(thin solid, blue)and
(thick solid, red), the approximate ground state of the quantum Rabi model
(crosses, pink), and the numerically determined ground state of the quantum Rabi model
(filled-dots, black) for (a) Δ/ω = 2, (b) Δ/ω = 5, and (c) Δ/ω = 10.